Alert archive / Illinois / Severe Thunderstorm Warnings in 1991

Severe Thunderstorm Warning 37, NWS Lincoln, IL

May 14, 1991Macoupin County, Montgomery County, Sangamon County, Illinois

NWS Lincoln, IL issued this severe thunderstorm warning at May 14, 1991, 4:46 PM CDT for Macoupin County, Montgomery County, Sangamon County, Illinois. It was in force for 44 min.

The area

The counties it named.

The facts

Issued
May 14, 1991, 4:46 PM CDT (21:46 UTC)
Expired
May 14, 1991, 5:30 PM CDT
In force
44 min
Issued by
NWS Lincoln, IL
Area
Whole counties

Counties Macoupin County, IL, Montgomery County, IL, Sangamon County, IL

The nearest sounding before it

Paducah/Barkley, KY (KPAH), launched 12:00Z, 9.8 hours before the alert went out and 275 km from the middle of its area. This is the routine balloon launch nearest before it, the air the forecaster had in hand, not a measurement taken for the alert.

Skew-T log-pSkew-T log-p diagram, Paducah/Barkley, KY at 12:00Z on 1991-05-14Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 64 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Paducah/Barkley, KY at 12:00Z on 1991-05-14The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -8 square meters per square second.1939Sfc1 km3 km6 km9 kmRMLM
The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.
Mixed-layer CAPE
64 J/kg
Mixed-layer CIN
-372 J/kg
Mixed-layer LCL
1288 m above ground
0-6 km bulk shear
15 kt
0-1 km storm-relative helicity
-8 m²/s²
0-3 km storm-relative helicity
28 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

The text of this product is not in the archive. The NWS text archive before 2002 is incomplete.

What forecasters said that day

The local office's own words before this severe thunderstorm warning went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

In the hours before

Special weather statement, May 14, 1:35 PM CDT, 3 hours 11 minutes before
ILZ005>007-009-141930-

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE PEORIA IL
135 PM CDT TUE MAY 14 1991

...SEVERE THUNDERSTORM WATCH NUMBER 330 IS IN EFFECT UNTIL 6 PM FOR
   EAST CENTRAL ILLINOIS... INCLUDING MCLEAN COUNTY...

AT 1:30 THIS AFTERNOON RADAR INDICATED SHOWERS OVER THE EASTERN HALF
OF MCLEAN COUNTY... MOVING EAST AT 15 MPH.

ELSEWHERE... A NEW THUNDERSTORM WAS DEVELOPING OVER KNOX COUNTY ABOUT
10 MILES EAST OF GALESBURG.
E
A COUPLE OF SHOWERS HAD ALSO DEVELOPED IN WESTERN PEORIA COUNTY BETWEEN
BRIMFIELD AND PEORIA.

MOVEMENT HAD NOT YET BEEN DETERMINED ON THESE NEW SHOWERS AND THUNDERSTORMS
BUT THEY ARE PROBABLY MOVING EAST AT 15 TO 20 MPH.
JACOBS
Special weather statement, May 14, 2:33 PM CDT, 2 hours 13 minutes before
ILZ005>007-009-142030-

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE PEORIA IL
230 PM CDT TUE MAY 14 1991

...STRONG THUNDERSTORMS IN WESTERN ILLINOIS...

STRONG THUNDERSTORMS WITH HEAVY RAIN...AND POSSIBLY SOME HAIL AND BRIEF
GUSTY WINDS...WERE NEAR ALTONA...20 MILES NORTHEAST OF GALESBURG AT 225 PM.
THE THUNDERSTORMS WERE DRIFTING SLOWLY TO THE NORTH AROUND 15 MPH. HEAVY
RAIN ASSOCIATED WITH THESE STORMS MAY RESULT IN PONDING OF WATER OR MINOR
FLOODING IN LOW LYING AREAS. THE THUNDERSTORMS ARE EXPECTED TO MOVE NORTH
OF KNOX COUNTY BY 300 PM.

A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT FOR EAST CENTRAL ILLINOIS
INCLUDING MCLEAN COUNTY UNTIL 600 PM. THERE HAVE BEEN NO RECENT REPORTS
OF SEVERE WEATHER FROM MCLEAN COUNTY. WEATHER SERVICE RADAR AT 225 PM
INDICATED AN AREA OF SHOWERS AND THUNDERSTORMS IN EASTERN MCLEAN COUNTY
ABOUT 20 MILES EAST OF BLOOMINGTON. THE SHOWERS AND STORMS WERE MOVING
EAST AROUND 15 MPH.              ~                                MILLER
Special weather statement, May 14, 4:18 PM CDT, 28 minutes before
ILZ007-142230-

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE PEORIA IL
415 PM CDT TUE MAY 14 1991

...SEVERE THUNDERSTORM WATCH CANCELLED...

THE SEVERE THUNDERSTORM WATCH THAT WAS IN EFFECT FOR EAST CENTRAL
ILLINOIS INCLUDING MCLEAN COUNTY HAS BEEN CANCELLED. THE THREAT OF
SEVERE WEATHER HAS TEMPORARILY ENDED.

ADDITIONAL DEVELOPMENT OF SCATTERED SHOWERS AND THUNDERSTORMS IS
EXPECTED IN CENTRAL ILLINOIS TONIGHT. SOME OF THESE STORMS MAY BE
SEVERE AND COULD PRODUCE VERY HEAVY RAIN...GUSTY WINDS AND HAIL.

PEOPLE IN CENTRAL ILLINOIS ARE ADVISED TO MONITOR THE WEATHER CLOSELY
TONIGHT AND STAY TUNED TO RADIO...TELEVISION...OR NOAA WEATHER RADIO
FOR LATER STATEMENTS...AND POSSIBLE WATCHES OR WARNINGS.

MILLER
Special weather statement, May 14, 4:29 PM CDT, 17 minutes before
ILZ009-10-142200-

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE SPRINGFIELD IL
430 PM CDT TUE MAY 14 1991

THE SEVERE THUNDERSTORM WATCH FOR CENTRAL AND EAST CENTRAL ILLINOIS HAS
BEEN CANCELLED.   A SEVERE THUNDERSTORM WATCH IS IN EFFECT FOR PARTS OF
SOUTH CENTRAL ILLINOIS UNTIL 900 PM CDT.

AT 420 PM...SHOWERS AND THUNDERSTORMS HAD DEVELOPED OVER WEST CENTRAL
ILLINOIS BETWEEN JACKSONVILLE AND SPRINGFIELD.  THESE STORMS WERE MOVING
SLOWLY SOUTHEAST AT 15 MPH AND PRODUCING HEAVY DOWNPOURS OF RAIN AND
DANGEROUS LIGHTNING.

OTHER SHOWERS AND SCATTERED THUNDERSTORMS WERE OVER EAST CENTRAL ILLINOIS
FROM DANVILLE TO VANDALIA.  THESE WERE ALSO MOVING SOUTHEAST AT 15 MPH.

PALMER

The office that day

Everything else NWS Lincoln, IL issued on the same UTC day.

IssuedProductOfficeCountiesLasted
May 14, 10:38 AM CDTTornado WarningILXTazewell67 min
May 14, 11:12 AM CDTTornado WarningILXDeWitt, Macon63 min
May 14, 11:14 AM CDTTornado WarningILXMcLean61 min
May 14, 12:15 PM CDTTornado WarningILXMcLean35 min
May 14, 12:16 PM CDTSevere Thunderstorm WarningILXLogan, Macon59 min
May 14, 12:33 PM CDTSevere Thunderstorm WarningILXChampaign57 min
May 14, 1:20 PM CDTTornado WarningILXColes, Douglas, Moultrie25 min
May 14, 2:00 PM CDTTornado WarningILXColes, Douglas, Edgar45 min
May 14, 2:48 PM CDTTornado WarningILXClark27 min
May 14, 3:00 PM CDTSevere Thunderstorm WarningILXBureau60 min
May 14, 5:53 PM CDTSevere Thunderstorm WarningILXMacoupin, Montgomery52 min

Nearby

Severe Thunderstorm Warnings in Illinois, 1991Every severe thunderstorm warning in 1991

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; the sounding from the Mesonet's radiosonde archive.